Along with the repeated translations from the ancient
catacombs of Rome and two fourteenth century fires in the
Archbasilica of Saint John Lateran, the rebuilding of St. Peter's is responsible for the destruction of approximately half of all
papal tombs. As a result,
Donato Bramante, the chief architect of modern St. Peter's Basilica, has been remembered as "
Mastro Ruinante" ("master wrecker"). Although the original basilica's construction was begun during the reign of emperor
Constantine I and completed in the fourth century,
Pope Leo I (440–461) was the first pope buried in the Constantian basilica. Over the centuries, both the atrium, chapels, and the nave of the basilica were packed with papal tombs, which were juggled between different sections of the church as construction took place on each section of the basilica. All that remains of the original tombs are a few sarcophagi and sculptural fragments. Allegedly,
Pope Julius II, the pope who initiated the destruction of the Constantinian basilica, wished to clear space for a "monstrous" tomb of his own by
Michelangelo. Very little is known about the placement and appearance of the original tombs: one of the most valuable accounts is that of church canon and historian
Giacomo Grimaldi (a senator of Genoa and the father of
Girolamo Grimaldi-Cavalleroni), who sketched the tombs as they were moved around the basilica on the way to their destruction; Grimaldi's sketches record the shape and complexity of the early tombs, many of which were three-tiered. Not all popes were buried in Rome.
See list of non-extant papal tombs ==Papal tombs==